Operating Lease Commitments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Total rent expense	$ 6.1	$ 2.5	$ 10.4	$ 5.0
2015					$ 7.0
2016					9.5
2017					6.5
2018					4.8
2019					3.8
2020					3.1
Thereafter					12.8
Total					$ 47.5