How to insert float values in to a map in C++?

i need to insert 3 values into a map of type std::map<int,std::pair<float,float> >.

std::map<int,std::pair<float,float> > my_MainMap;
std::map<float,float>  myMap1;
int iValue;
float fValue1, fValue2;       

I have tried 3 different methods for inserting values: Method 1:

myMap1.insert(std::pair<float, float>(fInnerRadius, fOuterRadius));
m_Mainmap.insert(std::pair<int,std::pair<float,float> >(i,myMap1 ));

Method 2:

m_Mainmap.insert(std::pair<int,std::pair<float,float>>::value_type(i,fOuterRadius,fInnerRadius));

Method 3:

myMap1.insert(std::pair<float, float>(fInnerRadius, fOuterRadius));
m_Mainmap.insert(std::make_pair(i,myMap1 ));

Code I have written is not comilping Where am I wrong?

In constructor 'std::pair<_T1, _T2>::pair(const std::pair<_U1, _U2>&) [with _U1 = int, _U2 = std::map<float, float>, _T1 = const int, _T2 = std::pair<float, float>]':
 error: no matching function for call to 'std::pair<float, float>::pair(const std::map<float, float>&)'