Fair Value Measurements - Table 1 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative Asset, Noncurrent		$ 9.9
Redeemable Noncontrolling Interest, Equity, Fair Value	$ 121.1	84.7
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable Noncontrolling Interest, Equity, Fair Value	0.0	0.0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable Noncontrolling Interest, Equity, Fair Value	0.0	0.0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable Noncontrolling Interest, Equity, Fair Value	$ 121.1	84.7
Other Long-Term Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative Asset, Noncurrent		9.9
Other Long-Term Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative Asset, Noncurrent		0.0
Other Long-Term Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative Asset, Noncurrent		0.0
Other Long-Term Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative Asset, Noncurrent		$ 9.9
Noncontrolling Interests
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Fair Value, Valuation Techniques	I	I
Restricted Marketable Securities [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale Securities, Fair Value	$ 16.1	$ 4.6
Fair Value, Valuation Techniques	M	M
Restricted Marketable Securities [Member] | Prepaid Expenses and Other Current Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale Securities, Fair Value	$ 0.0	$ 0.0
Restricted Marketable Securities [Member] | Prepaid Expenses and Other Current Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale Securities, Fair Value	16.1	4.6
Restricted Marketable Securities [Member] | Prepaid Expenses and Other Current Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale Securities, Fair Value	0.0	0.0
Restricted Marketable Securities [Member] | Other Long-Term Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale Securities, Fair Value	$ 40.1	$ 45.9
Fair Value, Valuation Techniques	M	M
Restricted Marketable Securities [Member] | Other Long-Term Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale Securities, Fair Value	$ 0.0	$ 0.0
Restricted Marketable Securities [Member] | Other Long-Term Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale Securities, Fair Value	40.1	45.9
Restricted Marketable Securities [Member] | Other Long-Term Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale Securities, Fair Value	$ 0.0	$ 0.0
Surgical Care Affiliates [Member] | Other Long-Term Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Fair Value, Valuation Techniques		M